Diagrams Softwares and Apps

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Dia

Dia

Open Source

Dia is free and open source drawing software.

Development Office & Productivity
Pencil Project

Pencil Project

Open Source

Pencil Project is an open-source GUI prototyping tool.

Photos & Graphics Web Browsers
draw.io

draw.io

Open Source

draw.io is free online diagram software for making flowcharts, process diagrams, etc

Business & Commerce Development Office & Productivity
UMLet

UMLet

Open Source

UMLet is an open-source Java-based UML tool designed for teaching the Unified Modeling Language and for quickly creating UML diagrams.